Re: 2.6.18-rc1-mm1

[Jeff Garzik]

Alan Cox wrote:
> The old drivers/ide code uses much longer delays than the spec for some
> ATAPI commands, and it looks as if there is a good reason for doing
> so ...


FWIW, the code that ATADRVR (http://www.ata-atapi.com/) uses to issue 
commands does something like

	write Command register to start command
	if (device == ATAPI)			# i.e. not ATA
		delay(150 msec)
	pound Status / AltStatus, kick DMA engine, whatever else

ATADRVR is open code (for an MS-DOS-level driver), and really worth a 
read.  Between ATADRVR and drivers/ide, you get a pretty good idea about 
what __field experience__ has shown is needed for ATAPI devices.

	Jeff



-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/